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decagon

noun

deca·​gon ˈde-kə-ˌgän How to pronounce decagon (audio)
: a plane polygon of 10 angles and 10 sides

Illustration of decagon

Illustration of decagon

Word History

Etymology

New Latin decagonum, from Greek dekagōnon, from deka- deca- + -gōnon -gon

First Known Use

circa 1639, in the meaning defined above

Time Traveler
The first known use of decagon was circa 1639

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